BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > M3 (E90 / E92 / E93) > Regional Forums > Australia
 
Steve Thomas BMW
Post Reply
 
Thread Tools Search this Thread
      09-05-2018, 01:08 AM   #1
pubo
New Member
2
Rep
9
Posts

Drives: E90 M3
Join Date: Jan 2016
Location: Sydney

iTrader: (0)

Throttle Actuator Circuit Fix (Possibly)

Okay here goes. After months of procrastination, I've finally got my arse off to write this fix for these morbidly expensive actuator units. Got most of my info to start off from here, hence I'd thought it'll be fair for me to share it since I'm not planning to capitalize on the information. Credits to the existing threads for proper disassembles and preliminary troubleshooting.

To take the damn things off, refer to
http://www.m3post.com/forums/showthread.php?t=735033

As for the circuit fix refer to this thread
http://www.m3post.com/forums/showthread.php?t=1068709

The critical point would be to replace the mosfets with one which performs better than the HUFA76429D3ST_F085T-ND which is mentioned in the thread above. I'm using AUIRFR2905Z on both actuators, 5 per actuator.

View post on imgur.com


The parameter to look out for (besides the usual package size, voltage rating, current rating, vgs threshold voltage etc) would be the Reverse Recovered Charge of the Mosfet's body diode. And yes, this FET is automotive qualified as per AEC-Q101 as well.

HUFA76429D3ST
View post on imgur.com


AUIRFR2905Z
View post on imgur.com


The whole issue with people replacing them mosfets and having only some slight chance of rectifying the actuator's circuit issue would be the replacement mostet's revese recovery response isn't acting fast enough to prevent the backlash from the DC motor of the throttle actuator. This in turn causes the throttle actuators jerk on the de-energising phase of the actuator which would cause the self test to fail on startup. From my tests any mosfet with reverse recovery QRR of less than 50nC works fine with our modules. I have only ever tested with 6 units of throttle actuators, 2 of them from my own car so do take note of that.

I've used a pair of the fixed unit on my e90 for about a year now without any issues whatsoever. Swapped out the worned oem gears with i6 automotive replacement gears. Usual disclaimer, you're going to have to do this fix on your own risk yada yada yada. Hope this will be of some help to another owner who isn't prepared to fork out thousands for a replacement unit. The END

Last edited by pubo; 09-05-2018 at 01:20 AM.
Appreciate 1
JJH221.50

Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 03:13 PM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST